Posted by Billy NY on July 26, 2014 at 10:06:22 from (188.8.131.52):
In Reply to: Concrete cracks posted by Jimdril on July 26, 2014 at 09:14:32:
Not likely, must have shrunk and separated, could be several issues to consider, reinforcing, the material itself, the weather when it was placed, hard to say, but once its fractured, even finely, you may be able to seal it with something elastomeric, at the joint of the crack there are sealants/caulking for this, but any coating, with expansion or contracting, the crack is likely to project through, sooner or later. Typically, if none of the above is an issue, relief or control cuts are placed, you don't have this problem on a slab of that size, placed at one time.
There are coatings, but they need to bond and be elastomeric enough to expand and contract with the slab, and most are not, there may be another underlying cause, excess shrinkage, not enough or correct reinforcing, did they place rebar, 6"x6" woven wire mesh, was the material good, what kind of mix design, how about the weather and hydration, (curing) all these can play a role in this.
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